Hoisting-gear



L LU e e. h S M e e, h S 2 B L L I V O O S A. & L

(No Model.)

HOISTING GEAR.

No. 300,142.; Patented-June 10, 18 84.

Nv FEIERS. PMln-Lllimriphet, Waxhingtom D c (No Model.) 2 Sheets-Sheet2.

I. 85 A. SGOVILLE. HOISTING GEAR.

No. 300,142. PatentedJune 10, 1884-.

N. rrrzna Fholo-Ulhognphcn Washinglon. 0.1:.

UNITED STATES PATENT which,

; IV ES SGGVILLE AND AVERY SCOVILLE, OF OAKLAND, CALIFORNIA.

HOlSTlNG-GEAR.

SPECIFICATION forming part of Letters Patent No. 300,142, dated June 10,1384. Application filed April 19, 1884. (No model.) 7

To all whom it may concern:

Be it known that we, lvEs ,SCOVILLE and AVERY SoovILLE, of the city ofOakland, county of Alameda, and State of California, have invented anImprovement in Hoisting- Gear; and we hereby declare the following to bea full, clear, and exact description thereof.

-Our invention relates to an improvement in hoisting-gear and itconsists of a frictional mechanism in connection with what is known asdifferential hoisting-gear, whereby the gear which is driven by aneccentric upon the main shaft may be connected so as to drive the drum,or disconnected sothat the drum may be allowed to revolvein a reversedirection without stopping or reversing the engine.

Referring to the accompanying drawings for a more complete explanationof our invention, Figure l is an end elevation, showing our invention.Fig. 2 is a horizontal section. Fig. 3 is an elevation showing recessedend of drum, gear, and cam.

In the present case we have shown our invention as applied to arope-winding drum, A, which is mounted so as to revolve loosely upon ashaft, B. To this shaft is keyed an eccentric,O,which loosely fits anopening in the hub of a toothed gear, D, so that when it is revolved itwill move the gear around with an eccentric motion. The end of the drumA is recessed, so that the gear D may move around within the recess, andit has an internal gear to fit the teeth of D. The internal gear has onetooth more than there are on the gear D. The pitch-line of theseinternal teeth forms a circle enough larger than that of the gear D toallow of the movement given the latter by the eccentric, and as thelatter moves around within the recess the teeth engage, the differencein'the number of teeth making the amount of advance given to the drum byeach revolution, and constituting a differential gear. In these gears ithas hitherto been necessary to reverse the whole machinery in order torotate the' drum in the opposite direction. I

In our device F is a circular flange, which projects outwardly from thevertical plane of the teeth, and is surrounded by a ring or strap, G,the upper part of which is divided, and has lugs or arms, as shown at HH. An arm, I, extends out to one side from this strap, and its outer endis supported by a rod or link, J, one end of which is pivoted to it,while the other is supported by the fulcrum-pin of the foot lever K. Thelugs H H are slotted to admit a plate, L, one end of which is pivoted tothe lug H, while the other is pinned to the upper part of the adjacentend of the lever M. The lower side of this lever has alug or projection,N, which is connected by a pin or otherthe outer end of the lever israised these'connections act upon the lugs H H to separate the ends ofthe strapflr and cause it to run loosely upon the hub or flange F. Thisallows the latter, with the gear and drum, to be turned backward, whilethe shaft, eccentric, and driving crank or gear may remain stationary orcontinue to move forward. The short arm of the foot-leverK is connectedwith the long arm of the lever M by a rod, P, so that when the footleverK is pressed down the lever M will act to loosen the strap G, as beforedescribed. WVhen relieved of this pressure, a spiral or other spring, Q,acts to force the outer end of the lever M down, and thus cause thestrap G to clamp the flange F firmly, so that the eccentric will againact through the gear to rotate the drum forward. By this arrangement itwill be seen that the drum may be used to wind a rope for hoisting orother purposes, which out stopping the engine.

R is a short lever-arm fixed to the fulcrum-. shaft of the foot-lever K,and it has a bandbrake, S, connected with it, so that when the upon therim of the drum with any desired force," and thus the speed at which thedrum moves in the reverse direction is regulated.

Having thus described our invention, what we claim as new, and desire tosecure by Letters Patent, is

1. In a differential winding-gear, the drum A, having therecessedinternally-toothed end, an interior spur-gear, D, of smallerdiameter and one less tooth, with a concentric hub, 0, having aneccentric revolving loosely within it andkeyed to the shaft, as shown,in combination with astrap, G, fitting the projecting hub or flange ofthe gear D, and a mechanism, as described, by which the strap may be maybe allowed to unwind at any time withstrap G is loosened the band may bepressed wise with the lug H. It will be seen that when clamped upon orloosened from the flange, sub stantially as herein described.

2. In combination with awindingdruni and differential driving-gear, asshown, a strap,Gr. open at one side, and having the arm I supported soas to be free to follow the movements of the eccentric without rotatingwith it, a lever, M, connected with the lugs H II of the open sides ofthe strap to open or close it upon the flange of the driving-gear,substantially as herein described.

3. In a differential driving-gear, the strap G, surrounding the flangeof the spur-gear D, open at one side, and having lugs which are actedupon by a lever, M, to open or clamp it upon the flange, in combinationwith a footlever, K, and spring Q, connected with the le vcr M,substantially as herein described.

4. In a differential gear, the strap G, surrounding the flange of thegear D, with its 20 guiding-arm I and operating-lever M, in combinationwith the foot-lever K, lever B, and band brake S, substantially asherein described.

In witness whereof wehave hereunto set our 25 hands.

IVES SOOVILLE. AVERY SOOVILLE.

Witnesses:

J. It. SEARS, JNo. O.MARsI-I.

